The SOPHIE search for northern extrasolar planets: XIII. Two planets around M-dwarfs Gl617A and Gl96

Planetary systems; Stars: individual: Gl617A; Stars: individual: Gl96; Stars: late-type; Techniques: radial velocities; Dwarf stars; Exo-planets; Minimum mass; Planetary system; Radial velocity measurements; Stars: individual; Stars:late type; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.EP

Abstract :

[en] We report the detection of two exoplanets and a further tentative candidate around the M-dwarf stars Gl96 and Gl617A, based on radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. Both stars were observed in the context of the SOPHIE exoplanet consortium's dedicated M-dwarf subprogramme, which aims to detect exoplanets around nearby M-dwarf stars through a systematic survey. For Gl96 we present the discovery of a new exoplanet at 73.9 d with a minimum mass of 19.66 earth masses. Gl96 b has an eccentricity of 0.44, placing it among the most eccentric planets orbiting M stars. For Gl617A we independently confirm a recently reported exoplanet at 86.7 d with a minimum mass of 31.29 earth masses. Both Gl96 b and Gl617A b are potentially within the habitable zone, although the high eccentricity of Gl96 b may take it too close to the star at periapsis.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Hobson, M.J.; Laboratoire d'Astrophysique de Marseille, UMR 7326, CNRS, Aix-Marseille Université, Marseille Cedex 13, France

Díaz, R.F.; Facultad de Ciencias Exactasy Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina ; Instituto de Astronomía y Física Del Espacio (IAFE), CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina

Delfosse, X.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France

Astudillo-Defru, N.; Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ; Observatoire Astronomique de LUniversité de Gen, Versoix, Switzerland

Boisse, I.; Laboratoire d'Astrophysique de Marseille, UMR 7326, CNRS, Aix-Marseille Université, Marseille Cedex 13, France

Bouchy, F.; Observatoire Astronomique de LUniversité de Gen, Versoix, Switzerland

Bonfils, X.; Observatoire Astronomique de LUniversité de Gen, Versoix, Switzerland

Forveille, T.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France

Hara, N.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France

Arnold, L.; Observatoire Astronomique de LUniversité de Gen, Versoix, Switzerland ; ASD/IMCCE, CNRS-UMR8028, Observatoire de Paris, PSL, UPMC, Paris, France

More authors (25 more)

Language :

English

Title :

The SOPHIE search for northern extrasolar planets: XIII. Two planets around M-dwarfs Gl617A and Gl96

Publication date :

October 2018

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

618

Issue :

A103

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.aanda.org/10.1051/0004-6361/201832732/pdf

Funding text :

Acknolw edgements. We warmly thank the OHP staff for their support on the observations. X.D., X.B., I.B., and T.F. received funding from the French Programme National de Physique Stellaire (PNPS) and the Programme National de Plan\u00E9tologie (PNP) of CNRS (INSU). N.S. and O.D. were supported by Funda\u00E7\u00E3o para a Ci\u00EAncia e a Tecnologia (FCT, Portugal) through national funds and by FEDER through COMPETE2020 in the context of the projects and grants reference UID/FIS/04434/2013 & POCI-01-0145-FEDER-007672, PTDC/FIS-AST/1526/2014 & POCI-01-0145-FEDER-016886, and IF/00169/2012/CP0150/CT0002. This publication makes use of the Data & Analysis Center for Exoplanets (DACE), which is a facility based at the University of Geneva (CH) dedicated to extrasolar planets data visualisation, exchange, and analysis. DACE is a platform of the Swiss National Centre of Competence in Research (NCCR) PlanetS, federating the Swiss expertise in Exoplanet research. The DACE platform is available at https://dace.unige.ch. We thank the anonymous referees for their comments which helped to improve this article.

Commentary :

22 pages, 23 figures

Available on ORBi :

since 27 February 2025

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